Phase transition and magnetotransport properties of ball-milled half-metallic CrO2
journal contributionposted on 15.11.2021, 21:35 authored by K-Y. Wang, L. Spinu, J. He, W. Zhou, W. Wang, Jinke Tang
Small CrO2 particles with mean diameters ranging from 11 to 25 nm have been prepared by ball milling. X-ray diffraction studies show a continuous lattice expansion with increasing milling time. A phase transition to Cr2O3 also occurs with a sudden increase in the amount of Cr2O3 found between 5 and 8 h of milling. The decreases of low-field magnetoresistance with increasing milling time is correlated to the expansion of the lattice parameters of CrO2, which probably leads to the reduction in its spin polarization. High-field magnetoresistance increases with the milling possibly due to the enhanced mixed valence of the chromium, which supports the double exchange model.
PublisherUniversity of Wyoming. Libraries
Journal titleJOURNAL OF APPLIED PHYSICS
CollectionFaculty Publications - Physics and Astronomy
- Library Sciences - LIBS